We have published a set of resources that we hope will help those just getting started with developing interceptor plug-ins.
In TASK solution #32 (Tessitura Optional Components in the Version Upgrades and Patches workspace) there is a ServicePluginsSamples.zip that contains a Visual Studio solution and a plug-in development document with some tips to help you get started. The Visual Studio solution contains a variety of samples showing techniques for handling what we think will be some common usage scenarios. Either the paid or free Express versions of Visual Studio can be used. Please note that these samples are structured for easy of readability by people with varying levels of familiarity with C#. To that end they may not have the optimal structure or robust data checking and error handling expected for production code. It is not recommended to deploy these samples directly into a production environment.
We have also published a new T-Cast called Creating Your First Custom Plug-in on TN.com at http://www.tessituranetwork.com/network/Learning/Webinars%20Archive/v11/Creating%20Your%20First%20Custom%20Plug-in.aspx
This T-Cast walks through setting up a development workstation, creating a simple Hello Interceptor plug-in using free Visual Studio Express C# and deploying the plug-in to an application server. It gives a good view of the end-to-end plug-in development process.
We hope these resources will be helpful.